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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f709a526adf62b6c1dca436f70050c65d31d5eee98d5eeb085fbebc9c054b4b7' 
  AND token = 'YTVOsGzd26JE6FVEN2SZVxnDra20EIAxCs4REfR2pBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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