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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd187e85811a8c74623ed5868a3f73df026e9b4137bbabf5158210f89a6937f4c' 
  AND token = 'pQX9OSgUBhPpK4NMFY0YFeNU41pG4gU2uyjsFpEeMbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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