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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5b0951c4e34b2f62a078c2f2ae63e1ec4e60d0b10dbf0d681d748235415abd' 
  AND token = 'F4MHiDaKiVRMP6ot6X2PR8zIPzBU9W9cX06bQOE29NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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