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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49a76f9f6528202b69fc022188a597052f4bde95ef474c75698830656a158ed' 
  AND token = 'jsS7/s4rzehmZCEzeKOaLvErmVIi9n5xWyB0VMs3qhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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