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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae93f4924de862d5a85c36faf25b87c8311990e3e7d90b0a9b26dab4df56f04a' 
  AND token = 'SKD6g6pVrjMaWqA9QbyqzPMIdlaJ2cUeXEEFDKTiW/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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