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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd81d763147edb8392e9e42e878da76e0876975e4e6973482f197bfd7982451' 
  AND token = 'Y4Ij0RWsv31IC4AVxJMnZ3bycr/cm+lGct37iEp9kXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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