SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc67c2da396d1e118873a735cc276ec4add0fd8d6fb16d5e644d90fb1c778aa' 
  AND token = 'hKIh9rjI7qU8swwv++ufun3PFzzwGOH6XXK0ll0W3Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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