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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d57e84e185e377a783e468260a8b544c7c812b846d5319b671745d06dba98d9' 
  AND token = 'x7oyAC9qDI0hMeA/f46aBAJLGPZAggLHTaweXJh6QH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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