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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f052adf50f257f9ec94fbdc6b6fc2eff7473cbf465ceef1723293f9df1c821c9' 
  AND token = 'FlQ50HUTICT6ctON5wOosI9k0Jcv6hh0K0ttcxF+FYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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