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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46995eb3319c0b7cbdd5621720e96960d73049f7e3880d8e76c4563323eba449' 
  AND token = 'sWkKPoaTfTNWWdHlnlc+a/IbKUqZ9DJI6fUTKgLnjNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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