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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834703dad0566fe37638a6c77c0c1a2b06ad76785c7c34e464c5aedafeadb600' 
  AND token = 'FNKrfRgIHT4zn4o/XVF1S2VOXKrP/N9zL3F5jrUyUAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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