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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5587241db1c1675c0409df089271c20868a75c3517dc3ad9dba4f82e8cb1bb90' 
  AND token = '4dNOhrlPi24KpBGdRnlgXqe5j12la/HVFKAF2q+dkBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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