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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dbfd4514fa1b3c8576b321c134b17bb9d08b2885b45fd7025f1e9217fc7ed1' 
  AND token = '5RfgRah4BCY3LI7S0wVyC3wCumdiMoivsAs220uyM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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