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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6ac3e1f5879810159507bb832d87c87edcd45cab16ba034785e08788e0127e' 
  AND token = 'djETBmKWtf5i4oHI9Pm8vJSVAvAlm4TwqPvtzfrbq3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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