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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d28c089c1d0f51489e79d9b37a91864e43f0f76c2cc4bdd5968dffb1d0b2ff1' 
  AND token = 'xFQZYF0/W9W7F3/W4tOiG1ZtHnRxgeB5or5KabH1WNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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