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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f44bdff8581abda13106d4f174dea1c63e73623f0a80af15f7e2f9e0e3f95de' 
  AND token = 'WKiYvRCQfSxkVOw1HTzQUU9esfgrnJnx5RpNW7j6MIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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