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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d912afac918326477ae6e746741a3549aa045c611d2169233febc0e3c283c5d' 
  AND token = 'McjWheNomHBkhqBgGJQTtQzqLkWpisdC9zqj5YcnWQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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