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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961af556f7e3c60f78f00f329665fb233ef752f163171bdc4ff210bfc619b472' 
  AND token = 'UCVGFwBk4zdE0GZOmMZb7Fn9t4a70QTA0Xlurad6pmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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