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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fb1ec63cf6a0c6b60b0f341f6ff999820092809af34ab2c6b2bf1ecd1e51ff' 
  AND token = 's+ybmbueAplIsV20yFPip8CyZif6QNpnyCNcjfDs+wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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