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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4655944b7551b5e092a9eca543d79cdd03259af133807d50e9a5e1053c5b19' 
  AND token = 'MfCA3yqZblbPtuNwDFhndrI+3fYkprUH164exEtGqoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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