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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a008a99ba83bea78a9cd282770858198fd26b6ebb9991f805d4d1ae628168d' 
  AND token = 'X9NwR7WXE/POWreO6+eJmgcJFvqh5XQACTxMJ+wIAGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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