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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708978e75281eb87ddec329e0ebd5201c171a4b2ed06166f66d5ddf9f7f160f' 
  AND token = 'LWRLNU4QpyTVrNJdU3vQa1Sh39j+sBnHHJdbM4leYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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