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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e851519545795c5fad6884e72ab60180e1e55bda457f2e45f04dc047cf66ae47' 
  AND token = 'gmYf7/CNdmGBwKL/5KplSg9sDf/I63BxCWRVwBBKu0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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