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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52626d76572e02f8cd1c139ea8005822b060f0c16f01fcb45366c400d6ce5e74' 
  AND token = 'qc8IViMTAg9u7BLBe+YVl6FuHmgp8zoNWzjP20JJw30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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