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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57afaf345e94f02ae87dde7a9ab77c7fc4f24807e1752aef2228d48473b62c18' 
  AND token = '+DEZvG3jsvC89ULPKGlaEjwGkJs3xatur2tb97jPERI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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