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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65d6e84bb7ae62b863d4b3d1ce4a062cf991956dff761c8cd774b30d875c2a7' 
  AND token = 'LWpIoeHbD49iIEXtn8460YtR18jk+nhEIzmu9LRZiWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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