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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffb3f88cf4209ccf33cacd05c85c3966971ab763e4dddfd87a22af3eb5a3b67' 
  AND token = '7HboSXRppJ7bPd+2Yu6hyHPAap0t249LlxksYWlgP9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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