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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc8543bae4c1755718251068b48a8ad0857254d207630155104b007c58c368a' 
  AND token = 'tKlSXDd4yFF+lrzrpZPaORCPijPErYgigRU28P6UyoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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