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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe8c7b7d0fafc5bfb2148ab8da58beba0cce2a820de64a237bd5b8acbf50b7d' 
  AND token = 'mXmC6wBWoz6Q0GkT48eX12kcOEngz/zhca8ItX8Dtgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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