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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2053ed6950699885cabfc4e1e29a85a3b6d0b95ca37c99a698ea7b863d9ce420' 
  AND token = 'lwUBGbvd4M9iucV3z/jVZEN+X+bN6xGN08iB39j0LpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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