SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2d7ac6458e939586fd140ef5060d76b3718ea7fd29ba1dc1ca6ae8b0547c4b' 
  AND token = 'BwfWBJq/SjzW2VH/IgWz64cY6q+cVHqorHpxH+NtsdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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