SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fb6540012f9d1e0ca3b2f19d6c9996d9e581c27033243a9d3c511e4711df2c' 
  AND token = 'ZvvqBmOlKvV70ViJljTm7yA054jBEOvBAxSXgLqVGxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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