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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e2c3af8c142dca92cee24e6ec189191542861c7b2879231004314058066544' 
  AND token = '7PR3wY+p7cxnlP9CR0WMAqKKewXuIPI1HiuesgaWx6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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