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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c75f023aecae75db71bdc0ef5c9fc3baefc16e73cdfa4f51d89a3133d91a49e' 
  AND token = 'R2hnSPHN7Yq7G6O/mpBe0XUHxMkTWi8czuve36CwcHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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