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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca48b77be96a3c4f5d3b3d770971c6a36546deb0953b93e75470d14cea8db8f' 
  AND token = 'O5xYtRuoUDCEor8uHlywrfa3u3IEvSkdqqJyvz9g8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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