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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1bb7bd49f7e1d99bb4cfa7d461586c5c59deedd43b4360995d7803d4d4bbd4' 
  AND token = 'vt2Dhkp7HRn6oJYkh4QUPpZ3eu6JKUTB3U3HMOgnXLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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