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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a6c2e819488cbb99ef450e24a2f1ac5c84fb222f1def54dc42365740da5b67' 
  AND token = 'hLkA0EUAEuv3MdC3AUEMvRyHP3mB2BqA1ua1EGKF7z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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