SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25a77597d9521b3388f8927f16696022905fec2931fcc124b0bc6ac8d606048' 
  AND token = '/HuIqYVSWieNsW28m6xls+F1bQvy7YDq4SsML2fZEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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