SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79595ba5caaec4fb6b0b1748d694305c854df13180f62f773064b825f85560aa' 
  AND token = 'pzprsBZl+1m+O2jylXbCGqmzydKgm3c/Nboa2y8ysdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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