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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a662900c879181a88052535eec730177ef9e553ffc7436f54ccf1d0e48cb21c1' 
  AND token = 'w+p10m+sIkj+YdYPmU94ayhfHdF3f4S8a7jG3wGwn5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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