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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f437a8718bb0b29eca6eef701ac73e0434bb03ca7696362726a718ce9ebe69' 
  AND token = 'sijQiEfGFrZf/Ys/q4I8j8QfJShSiJS0yuZb2RiOZMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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