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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1869e1ad5e0ebd2021b478dd093467368f882cb84f80bf033debcd4829cdb671' 
  AND token = 'McKBQekVHzgUaNFkF/WErzgzz8+bYRpba3nKfCPjwKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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