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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07101732d90dc1c550091fbb3971e126dc4ae03ca5e6eae8406f87d7abf3cb87' 
  AND token = 'yPCGGU5wyigY1RM7U123oADuvls7m9oeKqt6pmMdGIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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