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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac594eb3422f212bd489b52d7c001a7c114ae49349ddef46bdbdddd16c2ee7ab' 
  AND token = 'sLK3oMk5lLqH9VaIMd99IhPPay8Zrs/t8Qlokax+8mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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