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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dec7fb1cdc97a34d16406d37de4a1b04510fee4fee5c40d0ebd00fb6ff9e074' 
  AND token = 'j18QrnoJNyTCV/oj05XdBPsYlFabgthxJHD1a7c0s5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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