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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b70fa9e57ff6d23a292af46cd5aaa677ef934c6d1a5b4fe965232a38d7950a4' 
  AND token = 'nO8eS9cHGgl4gerB2lOoifuFyL7FKxIAtL2N37uavGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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