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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e60ea19ef8c886c23a427d454d58add0388ccc4c6710a62f95cf3affa0d0ca' 
  AND token = 'UyPnqItTUZWCW+3lkWpK3ib4uoSwmtFN7YR/VquqHG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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