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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2341c0514791588c04a7ba615055d06f7511459ac9f60fb1ce46d2bdec361ddc' 
  AND token = 'qqUagGeJLvf2eJ9A9biGAwPkNIZqnhkiuoYDQZuLPMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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