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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4d28cbe06974696fcf6b392070321d5f9d6ea7cdc2ac542036d3c5ac0735a4' 
  AND token = 'ro6GNB/XjZ3u0rqN5zkG20mB/RMIe7XWWwnvIXeN54U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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