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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d12da4437bcb7630771ead8d343d4da2a79f4f04f7eaab85d589ed1c2e4cfb' 
  AND token = 'IQS9XN8kozY5YJefo2yoj2gv0paTJ9bYjV/rj3l8EXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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