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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7e6dcc11d703daae82c16588cb781bd86d7d14eab0fe087acb127a52015880' 
  AND token = 'lD1fUnsPdyLr4BTmnAYvdcjivvjJCBgr1L40atqhOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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