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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3649058b35c1fb5ee6f8a0018d8e34ac8f6905b5d250a49f966f4f2631023698' 
  AND token = 'ulfvMZD08RWVXR5ElZsVaZVIEtJePVA+0IC4Hp+3fWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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