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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a92ef8db1a7243a50da9e546eed0bdea7eece5c12b56a9f3606d0af6771f2ca' 
  AND token = 'NZ0UBd+tG/zKQGT1ysdTwkhaNQkUQOP3GWVbCHX5QYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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