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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbeeee5849b26c85d2ca6d8bc5cc3738cb19de6522f3b2d171a98e82e29c5bbd' 
  AND token = 'CzgFtvv0g9/8AzKzDJA4KEA8dXCAUK3ZnFSe6QTzz54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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