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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec36f316d95c71cb3f788eb36ff91f7ccc3873f1b3cad9b3104f61f0807ab42a' 
  AND token = '4LJsmzOKwHQCwhlH9yNFz4nTRcr8pBJTZrWxCQBSVk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}