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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1439ace18183a07a566e1d6f11dd0379899a8b885f264df78339b97369976b1e' 
  AND token = 'Wy98wSDPecjtV2l2GaDyNLmEgPXGs7IJHSyj5baEDQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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