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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14054f1130750dfbbe801438edade31b2440bb3d42a46630a2e5cfb2ce84fae6' 
  AND token = 'Y1HlnYzkYpE+xzm+WdE2kZw5F6yC7s3el1ArhiWTXMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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