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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eed0dcf54a1adcea68f4451ceea5d21d4d8c03de4edd74456487b3186e8b9b8' 
  AND token = 'm8RwSjJiYvWw1pRi1CBr5YLhd8hUWyBYoAESpsF3UDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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