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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9549c96860cf1e16f694f8767e911b32f38f94ffa479a3e1a337777f3d057597' 
  AND token = 'LiJJivn88Bc7FbqRueEIh3CS8vzYskHKn3DJkpbJZY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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