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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bd4cee584abe00f391b7d7f5365c4324fe9ca5ed2542d44b4f2b23f0db1881' 
  AND token = 'vrA0cDA9TqG4FC+cfoKNC6Vl7XctyheBnlvzc1UUd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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