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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddf9f905b2a7e59319aced5f7a5831029ddceb05e9c68b78700002b165a2902' 
  AND token = 'y1M5+3xM14ilG0IaxgojlfnzNvzME5XpvbNnyKC+WEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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