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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8399da0ca003b45ea66c504cbe82b34ec6bfc2bd4bc4024017a950a377f2d9ba' 
  AND token = 'NPd/raCBOClTtloU1d7f9SF0od5EYhyOJF8TnkssiJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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