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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1965bad0354003958c4d4b8b7241685419e29a70a4833534f224af02d962530c' 
  AND token = '7bSjadDu9y5UIgB+0bdI3NH2mb03iAkMw5EttzeJtK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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