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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339e2653974fe9cc983c0d4f76710c9b0880a689de65e2c7733e2c75df54eb4f' 
  AND token = 'XeQqSfmpGpbyZ5UEOv5BpF5hi/GfCcfw9xGmK5x6wRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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