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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9955dfcaecbf3ae81c66f41c5c6a726a15fb2add40b236fd6308e8c5a1efd8' 
  AND token = 'QBUCrLtwnML/kbsRC09Se9H/vkpthLM825r6haPF4K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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