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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd82eff0341c101317f7256070d23c1e2fc5dba7ac82c3dea4e7e870422a3e8' 
  AND token = 's0pZ2ZaYz6T4hGmpNFsFFA2YzcBO2sghEdbyxSfil+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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