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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7162d30c961ed80f094fbeeb7e8de28bf818043d96cc1ddca498be0bb183fd66' 
  AND token = '3qUlYeI1bTTiYVBtwJFDKp/SFXcQdOwerI+R06ix0nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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