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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4177825b3a332aaae7ea91fcbfbca871ccb76f883fef58bb65b18c79a2c9d61' 
  AND token = 'T9lSP6kgrVD9aJcL+W4U3xDlsD/FRhoOxLKOh7pTfPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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